Siemens MOBILETT Plus Manual page 17

Power Supply
The block diagrams and the wiring diagram X037E, sheet 100, are the basis of the func-
tional description given below.
The unit can be connected to a grounded wall outlet with the mains cable.
Board D8 is powered from the power-line connection via the mains cable and switched on
by the main switch "S 11".
Fig. 1
Fuses U9 and U10, before board D8, protect the power lead-in.
The use of two fuses to protect the single phase power lead-in is required for safety rea-
sons as a result of the worldwide use of the unit.
Any conceivable short circuit current in the unit leads under all circumstances to a blown
fuse.
Board D8 can adapt by itself to line voltages between 100 V AC and 240 V AC.
Switching circuitry on this board furnishes a standard primary voltage at transformer T3.
Siemens-Elema AB
Solna, Sweden
Register 6 SPR8-215.850.02
Rev. 01
S11
Page 1 of 2
01.02 SPS-UD
5 - 1
5
MOBILETT Plus/ Plus E